package netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * description:
 * author:zt
 * date:2021-09-19
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    //当通道就绪就会触发该方法（给服务器端发送消息）
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client：" + ctx);
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello服务器，我是客户端", CharsetUtil.UTF_8));
    }

    //当通道有读取事件时，触发
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址：" + ctx.channel().remoteAddress());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();  //处理异常
    }
}
